I am trying to simulate the flow through the cyclone separator, can any one help me out in doing this...! I'm not able to put boundry conditions properly...! main problem is with turbulent kinetic energy and dissipation rate.....! after that in back flow turbulant KE ...! values which I got using the formulae are very huge...n sooner iterations are strated it get diverged....!

so please any one help me out...let me know how these BC's should be applied...?